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Figure 1
A schematic of the LCLS hard X-ray experimental hutches and their beam distribution system. Not shown are two mirrors upstream (left) of the XPP hutch which form a periscope to deliver the beam to XPP and beyond. Two large-offset double-crystal monochromators (LODCMs) can deliver monochromatic beam to the X-ray Pump–Probe (XPP) and X-ray Correlation Spectroscopy (XCS) instruments while transmitting most of the pink beam through the first crystal to another downstream instrument. One LODCM is located at XPP and the second one is near the end of the X-Ray Tunnel. Three mirrors in the X-Ray Tunnel can deliver the pink beam to all hutches of the Far Experimental Hall on their own beamline. Two mirrors form a periscope to XCS. The mirror for MEC/MFX can be used at two different angles to deliver the beam to the desired hutch. All mirrors are removed from the beam path to allow the beam to reach CXI. The MFX instrument can perform pink-beam experiments when multiplexed with the XPP instrument using the first LODCM in the Near Experimental Hall. The diagram illustrates that, although CXI and MEC are downstream of MFX, they are on differing paths and cannot be multiplexed with MFX in the typical way of using a thin crystal.

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